Adobe 65036570 Scripting Guide - Page 50

ADOBE DIRECTOR 11.0 13 Scripting Dictionary -- Lingo syntax put(ilk(1)) -- #integer put(ilk(1.05)) -- #float // JavaScript syntax trace(typeof(1)) // number trace(typeof(1.05)) // number In Lingo, you can convert a decimal to an integer by using the integer() function. You can also convert an integer to a decimal by performing a mathematical operation on the integer, for example, by multiplying an integer by a decimal. In JavaScript syntax, you can convert a string or a decimal number to a whole number by using the parseInt() function. As opposed to Lingo's integer() function, parseInt() rounds down. For example, the following statement rounds off the decimal number 3.9 and converts it to the integer 4 (Lingo) and the number 3 (JavaScript syntax): -- Lingo syntax theNumber = integer(3.9) -- results in a value of 4 // JavaScript syntax var theNumber = parseInt(3.9); // results in a value of 3 In Lingo, the value() function can convert a string into a numerical value. You can also use exponential notation with decimal numbers: for example, -1.1234e-100 or 123.4e+9. In Lingo, you can convert an integer or string to a decimal number by using the float() function. In JavaScript syntax, you can convert a string to a decimal number by using the parseFloat() function. For example, the following statement stores the value 3.0000 (Lingo) and 3 (JavaScript syntax) in the variable theNumber: -- Lingo syntax theNumber = float(3) -- results in a value of 3.0000 // JavaScript syntax var theNumber = parseFloat(3) // results in a value of 3 Constants A constant is a named value whose content never changes. In Lingo, the predefined terms TRUE, FALSE, VOID, and EMPTY are constants because their values are always the same. The predefined terms BACKSPACE, ENTER, QUOTE, RETURN, SPACE, and TAB are constants that refer to keyboard characters. For example, to test whether the last key pressed was the Space bar, use the following statement: -- Lingo syntax if _key.keyPressed() = SPACE then beep() In JavaScript syntax, you can access predefined constants using some of the data types that are unique to JavaScript syntax. For example, the Number object contains constants such as Number.MAX_VALUE and Number.NaN, the Math object contains constants such as Math.PI and Math.E, and so on. Note: This reference does not provide in-depth information about the predefined constants in JavaScript syntax. For more information on these constants, see one of the many third-party resources on the subject. In JavaScript syntax, you can also define your own custom constants by using the const keyword. For example, the following statement creates a constant named items, and assigns it a value of 20. This value cannot be changed after it has been created: // JavaScript syntax const items = 20;